package com.hmdp.utils;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
@Slf4j
public class RedisIdWorker {

    /**
     * 開始時間戳
     */
    private static final long BEGIN_TIMESTAMP = 1728847091L;
    /**
     * 序列號的位數
     */
    private static final int COUNT_BITS = 32;
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix) {
        // 1. 取得時間戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long tmeStamp = nowSecond - BEGIN_TIMESTAMP;

        // 2. 取得序列號
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));

        Long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        log.info("count:{}", count);

        return tmeStamp << COUNT_BITS | count;
    }


}
